Lock for an electrical switch



FIG. 1 is a front elevational view of a lock for an electrical switch showing my new design. The broken line showing the wall switch and switch plate is included for the purpose of illustrating environmental elements only and forms no part of the claimed design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof; the left side elevational view thereof being the mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a lock for an electrical switch, as shown and described. 